Method of making prestressed concrete poles, tubes, and support

Details Method of making prestressed concrete poles, tubes, and support Method of making prestressed concrete poles, tubes, and support

1980-03-03

1981-01-27

Flint, Jr., J. Howard

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Shaping against interior of a forming surface by rotation of...

264228, 425111, 425435, B28B 2134, B28B 120, B28B 130

Patent

active

042475163

ABSTRACT:
A method of making a prestressed concrete pole, including placing a heat softenable plastic pipe in a metal tube or pipe and filling the space between the pipes with concrete, rotating the metal pipe-concrete assembly rapidly to center the plastic pipe therein, applying hot fluid pressure to the interior of the plastic pipe, longitudinally prestressing the concrete pipe assembly for several hours while the concrete sets, and gradually releasing the fluid pressure and prestressing pressure to obtain a prestressed concrete pole.

REFERENCES:
patent: 2395216 (1946-02-01), Fitzpatrick
patent: 2474660 (1949-06-01), Fitzpatrick
patent: 2865078 (1958-12-01), Hasselblad
patent: 3583047 (1971-06-01), Uchiyama
patent: 3692889 (1972-09-01), Hetrich
patent: 4009982 (1977-03-01), Maier
patent: 4044088 (1977-08-01), Hume
patent: 4113823 (1978-09-01), Jida

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